Consider the following reversible chemical reactions
$ \begin{aligned} & \mathrm{A}_2(\mathrm{~g})+\mathrm{B}_2(\mathrm{~g}) \stackrel{\mathrm{K}_1}{\rightleftharpoons} 2 \mathrm{AB}(\mathrm{~g}) \\ & 6 \mathrm{AB}(\mathrm{~g}) \stackrel{\mathrm{K}_2}{\rightleftharpoons} 3 \mathrm{~A}_2(\mathrm{~g})+3 \mathrm{~B}_2(\mathrm{~g}) \end{aligned} $
The relation between $\mathrm{K}_1$ and $\mathrm{K}_2$ is